cockpituous-janitor.service fails often

[jelly]

There is some race condition in our cleanup script

Nov 15 09:29:50 rhos-01-1 systemd[1]: Failed to start cockpituous-janitor.service - Clean up cockpituous cruft.
Nov 16 09:31:48 rhos-01-1 systemd[1]: Starting cockpituous-janitor.service - Clean up cockpituous cruft...
Nov 16 09:31:48 rhos-01-1 sh[959706]: Error: no container with ID or name "a64f706db09d" found: no such container
Nov 16 09:31:48 rhos-01-1 systemd[1]: cockpituous-janitor.service: Main process exited, code=exited, status=123/n/a
Nov 16 09:31:48 rhos-01-1 systemd[1]: cockpituous-janitor.service: Failed with result 'exit-code'.
Nov 16 09:31:48 rhos-01-1 systemd[1]: Failed to start cockpituous-janitor.service - Clean up cockpituous cruft.
Nov 17 09:33:34 rhos-01-1 systemd[1]: Starting cockpituous-janitor.service - Clean up cockpituous cruft...
Nov 17 09:33:35 rhos-01-1 sh[1406362]: Error: no container with ID or name "1bf4ec8e4b40" found: no such container
Nov 17 09:33:35 rhos-01-1 systemd[1]: cockpituous-janitor.service: Main process exited, code=exited, status=123/n/a
Nov 17 09:33:35 rhos-01-1 systemd[1]: cockpituous-janitor.service: Failed with result 'exit-code'.
Nov 17 09:33:35 rhos-01-1 systemd[1]: Failed to start cockpituous-janitor.service - Clean up cockpituous cruft.
Nov 18 09:36:36 rhos-01-1 systemd[1]: Starting cockpituous-janitor.service - Clean up cockpituous cruft...
Nov 18 09:36:36 rhos-01-1 sh[1645852]: Error: no container with ID or name "40caed65ab94" found: no such container
Nov 18 09:36:36 rhos-01-1 systemd[1]: cockpituous-janitor.service: Main process exited, code=exited, status=123/n/a
Nov 18 09:36:36 rhos-01-1 systemd[1]: cockpituous-janitor.service: Failed with result 'exit-code'.
Nov 18 09:36:36 rhos-01-1 systemd[1]: Failed to start cockpituous-janitor.service - Clean up cockpituous cruft.

Starting the unit an hour later does make it the cleanup job succeed.